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                <p>因为Linux系统每次开机或者执行一些需要权限的命令时要输入密码，但是本身输入密码这件事就不太安全。综合现有情况，windows可以很方便的使用人脸识别，但是linux上指纹都不方便，也怕破坏启动配置。于是决定使用外部硬件的方式实现指纹识别后自动输入密码的功能。相对安全了点。</p>
<p><a target="_blank" rel="noopener" href="https://github.com/weiyouwozuiku/ESP32_BluetoothKeyboard"><strong>项目地址</strong></a></p>
<h3 id="功能逻辑">功能逻辑<a class="anchor" href="#功能逻辑">¶</a></h3>
<ol>
<li>通过蓝牙连接ESP32</li>
<li>通过AS608校验指纹</li>
<li>指纹校验通过则模拟成蓝牙键盘发送密码</li>
</ol>
<h3 id="硬件方面">硬件方面<a class="anchor" href="#硬件方面">¶</a></h3>
<ul>
<li>采用的ESP32作为主控，其本身自带WIFI和蓝牙，非常便于之后的功能改善。</li>
<li>AS608作为指纹传感器，负责指纹的录入和校验。</li>
<li>OLED SSD1306作为屏幕进行必要的显示，方便了解处理进度。</li>
</ul>
<p>ESP32的管脚图：</p>
<p><img src="https://cdn.jsdelivr.net/gh/weiyouwozuiku/weiyouwozuiku.github.io@src/source/_posts/%E5%B5%8C%E5%85%A5%E5%BC%8F/ESP32%E6%8C%87%E7%BA%B9%E8%93%9D%E7%89%99%E9%94%AE%E7%9B%98%E5%BC%80%E5%8F%91/ESP32%E6%8C%87%E7%BA%B9%E8%93%9D%E7%89%99%E9%94%AE%E7%9B%98%E5%BC%80%E5%8F%91_IO.png" alt="ESP32指纹蓝牙键盘开发_IO.png"></p>
<p><img src="https://cdn.jsdelivr.net/gh/weiyouwozuiku/weiyouwozuiku.github.io@src/source/_posts/%E5%B5%8C%E5%85%A5%E5%BC%8F/ESP32%E6%8C%87%E7%BA%B9%E8%93%9D%E7%89%99%E9%94%AE%E7%9B%98%E5%BC%80%E5%8F%91/ESP32%E6%8C%87%E7%BA%B9%E8%93%9D%E7%89%99%E9%94%AE%E7%9B%98%E5%BC%80%E5%8F%91_IO2.png" alt="ESP32指纹蓝牙键盘开发_IO2.png"></p>
<p>ESP32原理图：</p>
<p><img src="https://cdn.jsdelivr.net/gh/weiyouwozuiku/weiyouwozuiku.github.io@src/source/_posts/%E5%B5%8C%E5%85%A5%E5%BC%8F/ESP32%E6%8C%87%E7%BA%B9%E8%93%9D%E7%89%99%E9%94%AE%E7%9B%98%E5%BC%80%E5%8F%91/ESP32%E6%8C%87%E7%BA%B9%E8%93%9D%E7%89%99%E9%94%AE%E7%9B%98%E5%BC%80%E5%8F%91_%E5%8E%9F%E7%90%86%E5%9B%BE1.png" alt="ESP32指纹蓝牙键盘开发_原理图1.png"></p>
<p><img src="https://cdn.jsdelivr.net/gh/weiyouwozuiku/weiyouwozuiku.github.io@src/source/_posts/%E5%B5%8C%E5%85%A5%E5%BC%8F/ESP32%E6%8C%87%E7%BA%B9%E8%93%9D%E7%89%99%E9%94%AE%E7%9B%98%E5%BC%80%E5%8F%91/ESP32%E6%8C%87%E7%BA%B9%E8%93%9D%E7%89%99%E9%94%AE%E7%9B%98%E5%BC%80%E5%8F%91_%E5%8E%9F%E7%90%86%E5%9B%BE2.png" alt="ESP32指纹蓝牙键盘开发_原理图2.png"></p>
<p>IDE图方便选择的是Arduino的环境，在板子管理处添加如下字段，添加Esp32板子信息：</p>
<p><code>https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json</code>。</p>
<p>选择开发版<code>ESP32 Dev Module</code>。</p>
<p>安装库：<code>ESP8266 and ESP32 OLED driver for SSD1306 displays</code>和<code>Adafruit Fingerprint Senser Library</code>。</p>
<p>安装第三方库：从<code>https://github.com/T-vK/ESP32-BLE-Keyboard</code>下载并添加。</p>
<h3 id="电路连接">电路连接<a class="anchor" href="#电路连接">¶</a></h3>
<p>OLED：</p>
<ul>
<li>VCC-&gt;3.3V</li>
<li>GND-&gt;GND</li>
<li>SCL-&gt;接D22</li>
<li>SDA-&gt;D21</li>
</ul>
<p>AS608:</p>
<ul>
<li>VCC-&gt;3.3V(5V会烧坏元件)</li>
<li>GND-&gt;GND</li>
<li>TX-&gt;RX2</li>
<li>RX-&gt;TX2</li>
</ul>
<p><img src="https://cdn.jsdelivr.net/gh/weiyouwozuiku/weiyouwozuiku.github.io@src/source/_posts/%E5%B5%8C%E5%85%A5%E5%BC%8F/ESP32%E6%8C%87%E7%BA%B9%E8%93%9D%E7%89%99%E9%94%AE%E7%9B%98%E5%BC%80%E5%8F%91/ESP32%E6%8C%87%E7%BA%B9%E8%93%9D%E7%89%99%E9%94%AE%E7%9B%98%E5%BC%80%E5%8F%91_%E8%BF%9E%E7%BA%BF%E5%9B%BE.png" alt="ESP32指纹蓝牙键盘开发_连线图.png"></p>
<h3 id="代码">代码<a class="anchor" href="#代码">¶</a></h3>
<h4 id="指纹注册代码">指纹注册代码<a class="anchor" href="#指纹注册代码">¶</a></h4>
<pre class="line-numbers language-cpp" data-language="cpp"><code class="language-cpp"><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string">&lt;Adafruit_Fingerprint.h&gt;</span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">define</span> <span class="token macro-name">mySerial</span> <span class="token expression">Serial2 </span></span>

Adafruit_Fingerprint finger <span class="token operator">=</span> <span class="token function">Adafruit_Fingerprint</span><span class="token punctuation">(</span><span class="token operator">&amp;</span>mySerial<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token keyword">uint8_t</span> id<span class="token punctuation">;</span>

<span class="token keyword">void</span> <span class="token function">setup</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
  Serial<span class="token punctuation">.</span><span class="token function">begin</span><span class="token punctuation">(</span><span class="token number">9600</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token operator">!</span>Serial<span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token function">delay</span><span class="token punctuation">(</span><span class="token number">100</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"\n\nAdafruit Fingerprint sensor enrollment"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

  <span class="token comment">// set the data rate for the sensor serial port</span>
  finger<span class="token punctuation">.</span><span class="token function">begin</span><span class="token punctuation">(</span><span class="token number">57600</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

  <span class="token keyword">if</span> <span class="token punctuation">(</span>finger<span class="token punctuation">.</span><span class="token function">verifyPassword</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Found fingerprint sensor!"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Did not find fingerprint sensor :("</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token function">delay</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>

  Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token function">F</span><span class="token punctuation">(</span><span class="token string">"Reading sensor parameters"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  finger<span class="token punctuation">.</span><span class="token function">getParameters</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  Serial<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span><span class="token function">F</span><span class="token punctuation">(</span><span class="token string">"Status: 0x"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>finger<span class="token punctuation">.</span>status_reg<span class="token punctuation">,</span> HEX<span class="token punctuation">)</span><span class="token punctuation">;</span>
  Serial<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span><span class="token function">F</span><span class="token punctuation">(</span><span class="token string">"Sys ID: 0x"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>finger<span class="token punctuation">.</span>system_id<span class="token punctuation">,</span> HEX<span class="token punctuation">)</span><span class="token punctuation">;</span>
  Serial<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span><span class="token function">F</span><span class="token punctuation">(</span><span class="token string">"Capacity: "</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>finger<span class="token punctuation">.</span>capacity<span class="token punctuation">)</span><span class="token punctuation">;</span>
  Serial<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span><span class="token function">F</span><span class="token punctuation">(</span><span class="token string">"Security level: "</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>finger<span class="token punctuation">.</span>security_level<span class="token punctuation">)</span><span class="token punctuation">;</span>
  Serial<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span><span class="token function">F</span><span class="token punctuation">(</span><span class="token string">"Device address: "</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>finger<span class="token punctuation">.</span>device_addr<span class="token punctuation">,</span> HEX<span class="token punctuation">)</span><span class="token punctuation">;</span>
  Serial<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span><span class="token function">F</span><span class="token punctuation">(</span><span class="token string">"Packet len: "</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>finger<span class="token punctuation">.</span>packet_len<span class="token punctuation">)</span><span class="token punctuation">;</span>
  Serial<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span><span class="token function">F</span><span class="token punctuation">(</span><span class="token string">"Baud rate: "</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>finger<span class="token punctuation">.</span>baud_rate<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">uint8_t</span> <span class="token function">readnumber</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">uint8_t</span> num <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>

  <span class="token keyword">while</span> <span class="token punctuation">(</span>num <span class="token operator">==</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token operator">!</span> Serial<span class="token punctuation">.</span><span class="token function">available</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    num <span class="token operator">=</span> Serial<span class="token punctuation">.</span><span class="token function">parseInt</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
  <span class="token keyword">return</span> num<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">void</span> <span class="token function">loop</span><span class="token punctuation">(</span><span class="token punctuation">)</span>                     <span class="token comment">// run over and over again</span>
<span class="token punctuation">{</span>
  Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Ready to enroll a fingerprint!"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Please type in the ID # (from 1 to 127) you want to save this finger as..."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  id <span class="token operator">=</span> <span class="token function">readnumber</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>id <span class="token operator">==</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token comment">// ID #0 not allowed, try again!</span>
     <span class="token keyword">return</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
  Serial<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"Enrolling ID #"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>

  <span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token operator">!</span>  <span class="token function">getFingerprintEnroll</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">uint8_t</span> <span class="token function">getFingerprintEnroll</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>

  <span class="token keyword">int</span> p <span class="token operator">=</span> <span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>
  Serial<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"Waiting for valid finger to enroll as #"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">while</span> <span class="token punctuation">(</span>p <span class="token operator">!=</span> FINGERPRINT_OK<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    p <span class="token operator">=</span> finger<span class="token punctuation">.</span><span class="token function">getImage</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">switch</span> <span class="token punctuation">(</span>p<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">case</span> FINGERPRINT_OK<span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Image taken"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">break</span><span class="token punctuation">;</span>
    <span class="token keyword">case</span> FINGERPRINT_NOFINGER<span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">break</span><span class="token punctuation">;</span>
    <span class="token keyword">case</span> FINGERPRINT_PACKETRECIEVEERR<span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Communication error"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">break</span><span class="token punctuation">;</span>
    <span class="token keyword">case</span> FINGERPRINT_IMAGEFAIL<span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Imaging error"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">break</span><span class="token punctuation">;</span>
    <span class="token keyword">default</span><span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Unknown error"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">break</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>

  <span class="token comment">// OK success!</span>

  p <span class="token operator">=</span> finger<span class="token punctuation">.</span><span class="token function">image2Tz</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">switch</span> <span class="token punctuation">(</span>p<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">case</span> FINGERPRINT_OK<span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Image converted"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">break</span><span class="token punctuation">;</span>
    <span class="token keyword">case</span> FINGERPRINT_IMAGEMESS<span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Image too messy"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">return</span> p<span class="token punctuation">;</span>
    <span class="token keyword">case</span> FINGERPRINT_PACKETRECIEVEERR<span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Communication error"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">return</span> p<span class="token punctuation">;</span>
    <span class="token keyword">case</span> FINGERPRINT_FEATUREFAIL<span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Could not find fingerprint features"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">return</span> p<span class="token punctuation">;</span>
    <span class="token keyword">case</span> FINGERPRINT_INVALIDIMAGE<span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Could not find fingerprint features"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">return</span> p<span class="token punctuation">;</span>
    <span class="token keyword">default</span><span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Unknown error"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">return</span> p<span class="token punctuation">;</span>
  <span class="token punctuation">}</span>

  Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Remove finger"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token function">delay</span><span class="token punctuation">(</span><span class="token number">2000</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  p <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
  <span class="token keyword">while</span> <span class="token punctuation">(</span>p <span class="token operator">!=</span> FINGERPRINT_NOFINGER<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    p <span class="token operator">=</span> finger<span class="token punctuation">.</span><span class="token function">getImage</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
  Serial<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"ID "</span><span class="token punctuation">)</span><span class="token punctuation">;</span> Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>
  p <span class="token operator">=</span> <span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>
  Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Place same finger again"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">while</span> <span class="token punctuation">(</span>p <span class="token operator">!=</span> FINGERPRINT_OK<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    p <span class="token operator">=</span> finger<span class="token punctuation">.</span><span class="token function">getImage</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">switch</span> <span class="token punctuation">(</span>p<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">case</span> FINGERPRINT_OK<span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Image taken"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">break</span><span class="token punctuation">;</span>
    <span class="token keyword">case</span> FINGERPRINT_NOFINGER<span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">break</span><span class="token punctuation">;</span>
    <span class="token keyword">case</span> FINGERPRINT_PACKETRECIEVEERR<span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Communication error"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">break</span><span class="token punctuation">;</span>
    <span class="token keyword">case</span> FINGERPRINT_IMAGEFAIL<span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Imaging error"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">break</span><span class="token punctuation">;</span>
    <span class="token keyword">default</span><span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Unknown error"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">break</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>

  <span class="token comment">// OK success!</span>

  p <span class="token operator">=</span> finger<span class="token punctuation">.</span><span class="token function">image2Tz</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">switch</span> <span class="token punctuation">(</span>p<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">case</span> FINGERPRINT_OK<span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Image converted"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">break</span><span class="token punctuation">;</span>
    <span class="token keyword">case</span> FINGERPRINT_IMAGEMESS<span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Image too messy"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">return</span> p<span class="token punctuation">;</span>
    <span class="token keyword">case</span> FINGERPRINT_PACKETRECIEVEERR<span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Communication error"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">return</span> p<span class="token punctuation">;</span>
    <span class="token keyword">case</span> FINGERPRINT_FEATUREFAIL<span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Could not find fingerprint features"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">return</span> p<span class="token punctuation">;</span>
    <span class="token keyword">case</span> FINGERPRINT_INVALIDIMAGE<span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Could not find fingerprint features"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">return</span> p<span class="token punctuation">;</span>
    <span class="token keyword">default</span><span class="token operator">:</span>
      Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Unknown error"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">return</span> p<span class="token punctuation">;</span>
  <span class="token punctuation">}</span>

  <span class="token comment">// OK converted!</span>
  Serial<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"Creating model for #"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>  Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>

  p <span class="token operator">=</span> finger<span class="token punctuation">.</span><span class="token function">createModel</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>p <span class="token operator">==</span> FINGERPRINT_OK<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Prints matched!"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>p <span class="token operator">==</span> FINGERPRINT_PACKETRECIEVEERR<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Communication error"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> p<span class="token punctuation">;</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>p <span class="token operator">==</span> FINGERPRINT_ENROLLMISMATCH<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Fingerprints did not match"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> p<span class="token punctuation">;</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Unknown error"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> p<span class="token punctuation">;</span>
  <span class="token punctuation">}</span>

  Serial<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"ID "</span><span class="token punctuation">)</span><span class="token punctuation">;</span> Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>
  p <span class="token operator">=</span> finger<span class="token punctuation">.</span><span class="token function">storeModel</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>p <span class="token operator">==</span> FINGERPRINT_OK<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Stored!"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>p <span class="token operator">==</span> FINGERPRINT_PACKETRECIEVEERR<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Communication error"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> p<span class="token punctuation">;</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>p <span class="token operator">==</span> FINGERPRINT_BADLOCATION<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Could not store in that location"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> p<span class="token punctuation">;</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>p <span class="token operator">==</span> FINGERPRINT_FLASHERR<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Error writing to flash"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> p<span class="token punctuation">;</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Unknown error"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> p<span class="token punctuation">;</span>
  <span class="token punctuation">}</span>

  <span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h4 id="删除指纹代码">删除指纹代码<a class="anchor" href="#删除指纹代码">¶</a></h4>
<pre class="line-numbers language-cpp" data-language="cpp"><code class="language-cpp"><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">define</span> <span class="token macro-name">mySerial</span> <span class="token expression">Serial2</span></span>
Adafruit_Fingerprint finger <span class="token operator">=</span> <span class="token function">Adafruit_Fingerprint</span><span class="token punctuation">(</span><span class="token operator">&amp;</span>mySerial<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token keyword">void</span> <span class="token function">setup</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
  Serial<span class="token punctuation">.</span><span class="token function">begin</span><span class="token punctuation">(</span><span class="token number">9600</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token operator">!</span>Serial<span class="token punctuation">)</span><span class="token punctuation">;</span>  <span class="token comment">// For Yun/Leo/Micro/Zero/...</span>
  <span class="token function">delay</span><span class="token punctuation">(</span><span class="token number">100</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"\n\nDelete Finger"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

  <span class="token comment">// set the data rate for the sensor serial port</span>
  finger<span class="token punctuation">.</span><span class="token function">begin</span><span class="token punctuation">(</span><span class="token number">57600</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

  <span class="token keyword">if</span> <span class="token punctuation">(</span>finger<span class="token punctuation">.</span><span class="token function">verifyPassword</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Found fingerprint sensor!"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Did not find fingerprint sensor :("</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>


<span class="token keyword">uint8_t</span> <span class="token function">readnumber</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">uint8_t</span> num <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>

  <span class="token keyword">while</span> <span class="token punctuation">(</span>num <span class="token operator">==</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token operator">!</span> Serial<span class="token punctuation">.</span><span class="token function">available</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    num <span class="token operator">=</span> Serial<span class="token punctuation">.</span><span class="token function">parseInt</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
  <span class="token keyword">return</span> num<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">void</span> <span class="token function">loop</span><span class="token punctuation">(</span><span class="token punctuation">)</span>                     <span class="token comment">// run over and over again</span>
<span class="token punctuation">{</span>
  Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Please type in the ID # (from 1 to 127) you want to delete..."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">uint8_t</span> id <span class="token operator">=</span> <span class="token function">readnumber</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>id <span class="token operator">==</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token comment">// ID #0 not allowed, try again!</span>
     <span class="token keyword">return</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>

  Serial<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"Deleting ID #"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>

  <span class="token function">deleteFingerprint</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">uint8_t</span> <span class="token function">deleteFingerprint</span><span class="token punctuation">(</span><span class="token keyword">uint8_t</span> id<span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">uint8_t</span> p <span class="token operator">=</span> <span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>

  p <span class="token operator">=</span> finger<span class="token punctuation">.</span><span class="token function">deleteModel</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>

  <span class="token keyword">if</span> <span class="token punctuation">(</span>p <span class="token operator">==</span> FINGERPRINT_OK<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Deleted!"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>p <span class="token operator">==</span> FINGERPRINT_PACKETRECIEVEERR<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Communication error"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> p<span class="token punctuation">;</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>p <span class="token operator">==</span> FINGERPRINT_BADLOCATION<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Could not delete in that location"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> p<span class="token punctuation">;</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>p <span class="token operator">==</span> FINGERPRINT_FLASHERR<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"Error writing to flash"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> p<span class="token punctuation">;</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    Serial<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"Unknown error: 0x"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> Serial<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>p<span class="token punctuation">,</span> HEX<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> p<span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h4 id="使用代码">使用代码<a class="anchor" href="#使用代码">¶</a></h4>
<pre class="line-numbers language-cpp" data-language="cpp"><code class="language-cpp"><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string">"SSD1306Wire.h"</span>        <span class="token comment">// legacy: #include "SSD1306.h"</span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string">&lt;Wire.h&gt;</span>     </span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string">&lt;BleKeyboard.h&gt;</span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string">&lt;Adafruit_Fingerprint.h&gt;</span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">define</span> <span class="token macro-name">mySerial</span> <span class="token expression">Serial2 </span></span>
BleKeyboard bleKeyboard<span class="token punctuation">;</span>
SSD1306Wire <span class="token function">display</span><span class="token punctuation">(</span><span class="token number">0x3c</span><span class="token punctuation">,</span> <span class="token number">21</span><span class="token punctuation">,</span> <span class="token number">22</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
Adafruit_Fingerprint finger <span class="token operator">=</span> <span class="token function">Adafruit_Fingerprint</span><span class="token punctuation">(</span><span class="token operator">&amp;</span>mySerial<span class="token punctuation">)</span><span class="token punctuation">;</span> 
<span class="token comment">//ESP32上的蓝色指示灯，GPIO2控制</span>
<span class="token keyword">const</span> <span class="token keyword">int</span> led<span class="token operator">=</span><span class="token number">2</span><span class="token punctuation">;</span>
<span class="token keyword">void</span> <span class="token function">displayHello</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
  display<span class="token punctuation">.</span><span class="token function">clear</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  display<span class="token punctuation">.</span><span class="token function">setTextAlignment</span><span class="token punctuation">(</span>TEXT_ALIGN_LEFT<span class="token punctuation">)</span><span class="token punctuation">;</span>
  display<span class="token punctuation">.</span><span class="token function">setFont</span><span class="token punctuation">(</span>ArialMT_Plain_16<span class="token punctuation">)</span><span class="token punctuation">;</span>
  display<span class="token punctuation">.</span><span class="token function">drawStringMaxWidth</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">128</span><span class="token punctuation">,</span>
      <span class="token string">"Weclome to use King's fingerprint bluetooth keyboard!"</span> <span class="token punctuation">)</span><span class="token punctuation">;</span>
  display<span class="token punctuation">.</span><span class="token function">display</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">void</span> <span class="token function">displayMeg</span><span class="token punctuation">(</span>String meg<span class="token punctuation">,</span><span class="token keyword">int</span> showTime<span class="token operator">=</span><span class="token number">200</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
    display<span class="token punctuation">.</span><span class="token function">clear</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    display<span class="token punctuation">.</span><span class="token function">drawStringMaxWidth</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">128</span><span class="token punctuation">,</span>meg<span class="token punctuation">)</span><span class="token punctuation">;</span>
    display<span class="token punctuation">.</span><span class="token function">display</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token function">delay</span><span class="token punctuation">(</span>showTime<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">void</span> <span class="token function">displayMeg3line</span><span class="token punctuation">(</span>String meg1<span class="token punctuation">,</span>String meg2<span class="token punctuation">,</span>String meg3<span class="token punctuation">,</span><span class="token keyword">int</span> showTime<span class="token operator">=</span><span class="token number">1000</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
    display<span class="token punctuation">.</span><span class="token function">clear</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    display<span class="token punctuation">.</span><span class="token function">drawString</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span>meg1<span class="token punctuation">)</span><span class="token punctuation">;</span>
    display<span class="token punctuation">.</span><span class="token function">drawString</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">16</span><span class="token punctuation">,</span>meg2<span class="token punctuation">)</span><span class="token punctuation">;</span>
    display<span class="token punctuation">.</span><span class="token function">drawString</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">32</span><span class="token punctuation">,</span>meg3<span class="token punctuation">)</span><span class="token punctuation">;</span>
    display<span class="token punctuation">.</span><span class="token function">display</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token function">delay</span><span class="token punctuation">(</span>showTime<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">void</span> <span class="token function">connectFinger</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>finger<span class="token punctuation">.</span><span class="token function">verifyPassword</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">displayMeg</span><span class="token punctuation">(</span><span class="token string">"Found fingerprint sensor! :)"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    display<span class="token punctuation">.</span><span class="token function">clear</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">//Serial.println("Did't find fingerprint sensor :(");</span>
    display<span class="token punctuation">.</span><span class="token function">drawStringMaxWidth</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">128</span><span class="token punctuation">,</span><span class="token string">"Did't find fingerprint sensor :("</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    display<span class="token punctuation">.</span><span class="token function">display</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token function">delay</span><span class="token punctuation">(</span><span class="token number">2000</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> 
      <span class="token function">delay</span><span class="token punctuation">(</span><span class="token number">2000</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      display<span class="token punctuation">.</span><span class="token function">clear</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token comment">//Serial.println("waiting for fingerprint sensor...");</span>
      display<span class="token punctuation">.</span><span class="token function">drawStringMaxWidth</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">128</span><span class="token punctuation">,</span><span class="token string">"Waiting for fingerprint sensor..."</span><span class="token punctuation">)</span><span class="token punctuation">;</span> 
      display<span class="token punctuation">.</span><span class="token function">display</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">void</span> <span class="token function">getValid</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
  <span class="token function">displayMeg</span><span class="token punctuation">(</span><span class="token string">"Waiting for valid finger..."</span><span class="token punctuation">,</span><span class="token number">1000</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  finger<span class="token punctuation">.</span><span class="token function">getTemplateCount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>finger<span class="token punctuation">.</span>templateCount <span class="token operator">==</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">displayMeg</span><span class="token punctuation">(</span><span class="token string">"Sensor doesn't contain any fingerprint data. Please run the 'enroll'."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
  <span class="token keyword">else</span> <span class="token punctuation">{</span>
    <span class="token function">displayMeg</span><span class="token punctuation">(</span><span class="token string">"Sensor contains templates!   ._."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">void</span> <span class="token function">sendPassword</span><span class="token punctuation">(</span><span class="token keyword">uint8_t</span> id<span class="token punctuation">)</span><span class="token punctuation">{</span>
    <span class="token function">digitalWrite</span><span class="token punctuation">(</span>led<span class="token punctuation">,</span>HIGH<span class="token punctuation">)</span><span class="token punctuation">;</span>
    display<span class="token punctuation">.</span><span class="token function">clear</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">char</span> stringId<span class="token punctuation">[</span><span class="token number">25</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
    <span class="token function">itoa</span><span class="token punctuation">(</span>id<span class="token punctuation">,</span>stringId<span class="token punctuation">,</span><span class="token number">10</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    display<span class="token punctuation">.</span><span class="token function">drawString</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token string">"Fingerprint id :"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    display<span class="token punctuation">.</span><span class="token function">drawString</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">16</span><span class="token punctuation">,</span>stringId<span class="token punctuation">)</span><span class="token punctuation">;</span>
    display<span class="token punctuation">.</span><span class="token function">display</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">if</span><span class="token punctuation">(</span>bleKeyboard<span class="token punctuation">.</span><span class="token function">isConnected</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      bleKeyboard<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"hello world"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//自定义密码</span>
      bleKeyboard<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>KEY_RETURN<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    display<span class="token punctuation">.</span><span class="token function">drawString</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">32</span><span class="token punctuation">,</span><span class="token string">"Key sended by BT!"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    display<span class="token punctuation">.</span><span class="token function">display</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token function">delay</span><span class="token punctuation">(</span><span class="token number">3000</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token function">digitalWrite</span><span class="token punctuation">(</span>led<span class="token punctuation">,</span>LOW<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">uint8_t</span> <span class="token function">getFingerprintID</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
  <span class="token keyword">uint8_t</span> p <span class="token operator">=</span> finger<span class="token punctuation">.</span><span class="token function">getImage</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">switch</span> <span class="token punctuation">(</span>p<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">case</span> FINGERPRINT_OK<span class="token operator">:</span>
      <span class="token comment">//Serial.println("Image taken");</span>
      <span class="token keyword">break</span><span class="token punctuation">;</span>
    <span class="token keyword">case</span> FINGERPRINT_NOFINGER<span class="token operator">:</span>
      <span class="token comment">//Serial.println("No finger detected");</span>
      <span class="token keyword">return</span> p<span class="token punctuation">;</span>
    <span class="token keyword">case</span> FINGERPRINT_PACKETRECIEVEERR<span class="token operator">:</span>
      <span class="token comment">//Serial.println("Communication error");</span>
      <span class="token keyword">return</span> p<span class="token punctuation">;</span>
    <span class="token keyword">case</span> FINGERPRINT_IMAGEFAIL<span class="token operator">:</span>
      <span class="token comment">//Serial.println("Imaging error");</span>
      <span class="token keyword">return</span> p<span class="token punctuation">;</span>
    <span class="token keyword">default</span><span class="token operator">:</span>
      <span class="token comment">//Serial.println("Unknown error");</span>
      <span class="token keyword">return</span> p<span class="token punctuation">;</span>
  <span class="token punctuation">}</span>

  <span class="token comment">// OK success!</span>

  p <span class="token operator">=</span> finger<span class="token punctuation">.</span><span class="token function">image2Tz</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">switch</span> <span class="token punctuation">(</span>p<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">case</span> FINGERPRINT_OK<span class="token operator">:</span>
      <span class="token comment">//Serial.println("Image converted");</span>
      <span class="token keyword">break</span><span class="token punctuation">;</span>
    <span class="token keyword">case</span> FINGERPRINT_IMAGEMESS<span class="token operator">:</span>
      <span class="token comment">//Serial.println("Image too messy");</span>
      <span class="token keyword">return</span> p<span class="token punctuation">;</span>
    <span class="token keyword">case</span> FINGERPRINT_PACKETRECIEVEERR<span class="token operator">:</span>
      <span class="token comment">//Serial.println("Communication error");</span>
      <span class="token keyword">return</span> p<span class="token punctuation">;</span>
    <span class="token keyword">case</span> FINGERPRINT_FEATUREFAIL<span class="token operator">:</span>
      <span class="token comment">//Serial.println("Could not find fingerprint features");</span>
      <span class="token keyword">return</span> p<span class="token punctuation">;</span>
    <span class="token keyword">case</span> FINGERPRINT_INVALIDIMAGE<span class="token operator">:</span>
      <span class="token comment">//Serial.println("Could not find fingerprint features");</span>
      <span class="token keyword">return</span> p<span class="token punctuation">;</span>
    <span class="token keyword">default</span><span class="token operator">:</span>
      <span class="token comment">//Serial.println("Unknown error");</span>
      <span class="token keyword">return</span> p<span class="token punctuation">;</span>
  <span class="token punctuation">}</span>

  <span class="token comment">// OK converted!</span>
  p <span class="token operator">=</span> finger<span class="token punctuation">.</span><span class="token function">fingerSearch</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>p <span class="token operator">==</span> FINGERPRINT_OK<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment">//Serial.println("Found a print match!");</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>p <span class="token operator">==</span> FINGERPRINT_PACKETRECIEVEERR<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment">//Serial.println("Communication error");</span>
    <span class="token keyword">return</span> p<span class="token punctuation">;</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>p <span class="token operator">==</span> FINGERPRINT_NOTFOUND<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment">//Serial.println("Did not find a match");</span>
    <span class="token keyword">return</span> p<span class="token punctuation">;</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    <span class="token comment">//Serial.println("Unknown error");</span>
    <span class="token keyword">return</span> p<span class="token punctuation">;</span>
  <span class="token punctuation">}</span>

  <span class="token comment">// found a match!</span>
  <span class="token comment">//Serial.print("Found ID #"); Serial.print(finger.fingerID);</span>
  <span class="token comment">//Serial.print(" with confidence of "); Serial.println(finger.confidence);</span>
  <span class="token function">sendPassword</span><span class="token punctuation">(</span>finger<span class="token punctuation">.</span>fingerID<span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">return</span> finger<span class="token punctuation">.</span>fingerID<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">void</span> <span class="token function">checkBlueTooth</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
  String bluetoothStatue<span class="token punctuation">;</span>
  <span class="token keyword">if</span><span class="token punctuation">(</span>bleKeyboard<span class="token punctuation">.</span><span class="token function">isConnected</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
    bluetoothStatue<span class="token operator">=</span><span class="token string">"BT connected!"</span><span class="token punctuation">;</span>
    <span class="token function">displayMeg3line</span><span class="token punctuation">(</span>bluetoothStatue<span class="token punctuation">,</span><span class="token string">"Waiting your fing-"</span><span class="token punctuation">,</span><span class="token string">"er,King!"</span><span class="token punctuation">,</span><span class="token number">50</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token keyword">else</span><span class="token punctuation">{</span>
    bluetoothStatue<span class="token operator">=</span><span class="token string">"BT unconnected!"</span><span class="token punctuation">;</span>
    <span class="token function">displayMeg3line</span><span class="token punctuation">(</span>bluetoothStatue<span class="token punctuation">,</span><span class="token string">"Please restart or "</span><span class="token punctuation">,</span><span class="token string">"connect!"</span><span class="token punctuation">,</span><span class="token number">50</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">void</span> <span class="token function">setup</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token comment">//Serial.begin(115200);</span>
  <span class="token comment">//Serial.println("Weclome to use King's fingerprint bluetooth keyboard!");</span>
  <span class="token function">pinMode</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">,</span> OUTPUT<span class="token punctuation">)</span><span class="token punctuation">;</span>
  display<span class="token punctuation">.</span><span class="token function">init</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  display<span class="token punctuation">.</span><span class="token function">flipScreenVertically</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token function">displayHello</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  bleKeyboard<span class="token punctuation">.</span><span class="token function">begin</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  finger<span class="token punctuation">.</span><span class="token function">begin</span><span class="token punctuation">(</span><span class="token number">57600</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token function">connectFinger</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token function">getValid</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">void</span> <span class="token function">loop</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">//  displayMeg("Waiting your finger,king!");</span>
  <span class="token function">checkBlueTooth</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token function">getFingerprintID</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>想要修改默认的蓝牙名称需要在默认<code>C:\Users\&lt;用户名&gt;\Documents\Arduino\libraries\ESP32-BLE-Keyboard</code>的<code>BleKeyboard.h</code>的第101行进行修改。</p>
<h3 id="遇到的问题">遇到的问题<a class="anchor" href="#遇到的问题">¶</a></h3>
<p>在开发过程中，当OLED显示屏没有在和ESP32同时上电，可能导致OLED屏幕无法显示。但是在电脑端未出现此问题。同时采用ESP32的电源进行供电就没有此问题。</p>
<h3 id="可选升级">可选升级<a class="anchor" href="#可选升级">¶</a></h3>
<h4 id="通过树莓派控制供电">通过树莓派控制供电<a class="anchor" href="#通过树莓派控制供电">¶</a></h4>
<p>USB 接口的供电并不是通过 GPIO 直接控制的，而是通过 USB 集线器 LAN9514 控制的。CPU 可以通过设置集线器的 PORT_POWER 选项完成 USB 供电电路的开关。</p>
<p>控制 USB 供电的电路出现在 Raspberry Pi Model B+ 之后的版本。原版的 Raspberry Pi Model B 的 USB 供电电路直接与 5V 相连，不受控制。</p>
<p>-P 参数用于指定要控制的端口，1 为集成网卡，2 为 4 个 USB 口。网卡的供电可以独立控制，所以开关 USB 口的供电并不会导致 ssh 断开。</p>
<p>下载并编译 <a target="_blank" rel="noopener" href="https://github.com/codazoda/hub-ctrl.c">hub-ctrl.c</a>（这个程序依赖于 libusb，编译时请带上参数 -lusb）。</p>
<p>调用如下命令控制USB的供电：</p>
<pre class="line-numbers language-bash" data-language="bash"><code class="language-bash">//查看设备
lsusb
//USB供电
<span class="token function">sudo</span> /home/pi/hub-ctrl.c/hub-ctrl <span class="token parameter variable">-b</span> 001 <span class="token parameter variable">-d</span> 002 <span class="token parameter variable">-P</span> <span class="token number">2</span> <span class="token parameter variable">-p</span> <span class="token number">1</span>
//USB不供电
<span class="token function">sudo</span> /home/pi/hub-ctrl.c/hub-ctrl <span class="token parameter variable">-b</span> 001 <span class="token parameter variable">-d</span> 002 <span class="token parameter variable">-P</span> <span class="token number">2</span> <span class="token parameter variable">-p</span> <span class="token number">0</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>设置定时任务：</p>
<pre class="line-numbers language-bash" data-language="bash"><code class="language-bash"><span class="token function">sudo</span> <span class="token function">crontab</span> <span class="token parameter variable">-e</span>
//命令如下
//每天7点30供电，21点40停止供电
<span class="token number">30</span> <span class="token number">7</span> * * * /home/pi/hub-ctrl.c/hub-ctrl <span class="token parameter variable">-b</span> 001 <span class="token parameter variable">-d</span> 002 <span class="token parameter variable">-P</span> <span class="token number">2</span> <span class="token parameter variable">-p</span> <span class="token number">0</span>
<span class="token number">40</span> <span class="token number">21</span> * * * /home/pi/hub-ctrl.c/hub-ctrl <span class="token parameter variable">-b</span> 001 <span class="token parameter variable">-d</span> 002 <span class="token parameter variable">-P</span> <span class="token number">2</span> <span class="token parameter variable">-p</span> <span class="token number">1</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h4 id="添加触摸传感器">添加触摸传感器<a class="anchor" href="#添加触摸传感器">¶</a></h4>
<p>为了避免长时间供电损坏引脚以及避免烧屏，采用传感器触发开启指纹。</p>
<p>添加触摸传感器，其只有三个引脚VCC、GND、Sig。</p>
<p>通过Respeaker上的Grove接口预留的GPIO12采集其信号。当检测到触摸传感器被触摸后返回的高电平信号，树莓派给USB口供电，启动指纹蓝牙键盘。使用树莓派的<img src="https://math.now.sh?inline=I%5E2C" style="filter: opacity(95%);transform:scale(0.85);text-align:center;display:inline-block;margin: 0;">连接SSD1306的OLED屏幕显示树莓派当前状态，并将每次的log信息保存在项目文件夹中。</p>
<p>代码如下：</p>
<pre class="line-numbers language-python" data-language="python"><code class="language-python"><span class="token keyword">import</span> time
<span class="token keyword">import</span> subprocess
<span class="token keyword">from</span> board <span class="token keyword">import</span> SCL<span class="token punctuation">,</span> SDA
<span class="token keyword">import</span> busio
<span class="token keyword">from</span> PIL <span class="token keyword">import</span> Image<span class="token punctuation">,</span> ImageDraw<span class="token punctuation">,</span> ImageFont
<span class="token keyword">import</span> adafruit_ssd1306
<span class="token keyword">import</span> RPi<span class="token punctuation">.</span>GPIO <span class="token keyword">as</span> GPIO
<span class="token keyword">import</span> os
Touch <span class="token operator">=</span> <span class="token number">12</span>
GPIO<span class="token punctuation">.</span>setmode<span class="token punctuation">(</span>GPIO<span class="token punctuation">.</span>BCM<span class="token punctuation">)</span>
GPIO<span class="token punctuation">.</span>setup<span class="token punctuation">(</span>Touch<span class="token punctuation">,</span> GPIO<span class="token punctuation">.</span>IN<span class="token punctuation">)</span>
<span class="token comment"># Create the I2C interface.</span>
i2c <span class="token operator">=</span> busio<span class="token punctuation">.</span>I2C<span class="token punctuation">(</span>SCL<span class="token punctuation">,</span> SDA<span class="token punctuation">)</span>

disp <span class="token operator">=</span> adafruit_ssd1306<span class="token punctuation">.</span>SSD1306_I2C<span class="token punctuation">(</span><span class="token number">128</span><span class="token punctuation">,</span> <span class="token number">64</span><span class="token punctuation">,</span> i2c<span class="token punctuation">)</span>

disp<span class="token punctuation">.</span>fill<span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span>
disp<span class="token punctuation">.</span>show<span class="token punctuation">(</span><span class="token punctuation">)</span>

width <span class="token operator">=</span> disp<span class="token punctuation">.</span>width
height <span class="token operator">=</span> disp<span class="token punctuation">.</span>height
image <span class="token operator">=</span> Image<span class="token punctuation">.</span>new<span class="token punctuation">(</span><span class="token string">"1"</span><span class="token punctuation">,</span> <span class="token punctuation">(</span>width<span class="token punctuation">,</span> height<span class="token punctuation">)</span><span class="token punctuation">)</span>

draw <span class="token operator">=</span> ImageDraw<span class="token punctuation">.</span>Draw<span class="token punctuation">(</span>image<span class="token punctuation">)</span>

draw<span class="token punctuation">.</span>rectangle<span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> width<span class="token punctuation">,</span> height<span class="token punctuation">)</span><span class="token punctuation">,</span> outline<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">,</span> fill<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">)</span>

padding <span class="token operator">=</span> <span class="token operator">-</span><span class="token number">2</span>
top <span class="token operator">=</span> padding
bottom <span class="token operator">=</span> height <span class="token operator">-</span> padding
<span class="token comment"># Move left to right keeping track of the current x position for drawing shapes.</span>
x <span class="token operator">=</span> <span class="token number">0</span>

font <span class="token operator">=</span> ImageFont<span class="token punctuation">.</span>truetype<span class="token punctuation">(</span>
    <span class="token string">'/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf'</span><span class="token punctuation">,</span> <span class="token number">13</span><span class="token punctuation">)</span>

<span class="token keyword">def</span> <span class="token function">displayInfo</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">:</span>
    draw<span class="token punctuation">.</span>rectangle<span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> width<span class="token punctuation">,</span> height<span class="token punctuation">)</span><span class="token punctuation">,</span> outline<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">,</span> fill<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">)</span>

    cmd <span class="token operator">=</span> <span class="token string">"hostname -I | cut -d' ' -f1"</span>
    IP <span class="token operator">=</span> subprocess<span class="token punctuation">.</span>check_output<span class="token punctuation">(</span>cmd<span class="token punctuation">,</span> shell<span class="token operator">=</span><span class="token boolean">True</span><span class="token punctuation">)</span><span class="token punctuation">.</span>decode<span class="token punctuation">(</span><span class="token string">"utf-8"</span><span class="token punctuation">)</span>
    cmd <span class="token operator">=</span> <span class="token string">"top -bn1 | grep load | awk '{printf \"CPU Load: %.2f\", $(NF-2)}'"</span>
    CPU <span class="token operator">=</span> subprocess<span class="token punctuation">.</span>check_output<span class="token punctuation">(</span>cmd<span class="token punctuation">,</span> shell<span class="token operator">=</span><span class="token boolean">True</span><span class="token punctuation">)</span><span class="token punctuation">.</span>decode<span class="token punctuation">(</span><span class="token string">"utf-8"</span><span class="token punctuation">)</span>
    cmd <span class="token operator">=</span> <span class="token string">"free -m | awk 'NR==2{printf \"Mem:%s/%s %.2f%%\", $3,$2,$3*100/$2 }'"</span>
    MemUsage <span class="token operator">=</span> subprocess<span class="token punctuation">.</span>check_output<span class="token punctuation">(</span>cmd<span class="token punctuation">,</span> shell<span class="token operator">=</span><span class="token boolean">True</span><span class="token punctuation">)</span><span class="token punctuation">.</span>decode<span class="token punctuation">(</span><span class="token string">"utf-8"</span><span class="token punctuation">)</span>
    cmd <span class="token operator">=</span> <span class="token string">'df -h | awk \'$NF=="/"{printf "Disk:%d/%d GB  %s", $3,$2,$5}\''</span>
    Disk <span class="token operator">=</span> subprocess<span class="token punctuation">.</span>check_output<span class="token punctuation">(</span>cmd<span class="token punctuation">,</span> shell<span class="token operator">=</span><span class="token boolean">True</span><span class="token punctuation">)</span><span class="token punctuation">.</span>decode<span class="token punctuation">(</span><span class="token string">"utf-8"</span><span class="token punctuation">)</span>

    <span class="token comment"># Write four lines of text.</span>

    draw<span class="token punctuation">.</span>text<span class="token punctuation">(</span><span class="token punctuation">(</span>x<span class="token punctuation">,</span> top <span class="token operator">+</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token string">"IP: "</span> <span class="token operator">+</span> IP<span class="token punctuation">,</span> font<span class="token operator">=</span>font<span class="token punctuation">,</span> fill<span class="token operator">=</span><span class="token number">255</span><span class="token punctuation">)</span>
    draw<span class="token punctuation">.</span>text<span class="token punctuation">(</span><span class="token punctuation">(</span>x<span class="token punctuation">,</span> top <span class="token operator">+</span> <span class="token number">15</span><span class="token punctuation">)</span><span class="token punctuation">,</span> CPU<span class="token punctuation">,</span> font<span class="token operator">=</span>font<span class="token punctuation">,</span> fill<span class="token operator">=</span><span class="token number">255</span><span class="token punctuation">)</span>
    draw<span class="token punctuation">.</span>text<span class="token punctuation">(</span><span class="token punctuation">(</span>x<span class="token punctuation">,</span> top <span class="token operator">+</span> <span class="token number">31</span><span class="token punctuation">)</span><span class="token punctuation">,</span> MemUsage<span class="token punctuation">,</span> font<span class="token operator">=</span>font<span class="token punctuation">,</span> fill<span class="token operator">=</span><span class="token number">255</span><span class="token punctuation">)</span>
    draw<span class="token punctuation">.</span>text<span class="token punctuation">(</span><span class="token punctuation">(</span>x<span class="token punctuation">,</span> top <span class="token operator">+</span> <span class="token number">47</span><span class="token punctuation">)</span><span class="token punctuation">,</span> Disk<span class="token punctuation">,</span> font<span class="token operator">=</span>font<span class="token punctuation">,</span> fill<span class="token operator">=</span><span class="token number">255</span><span class="token punctuation">)</span>

    <span class="token comment"># Display image.</span>
    disp<span class="token punctuation">.</span>image<span class="token punctuation">(</span>image<span class="token punctuation">)</span>
    disp<span class="token punctuation">.</span>show<span class="token punctuation">(</span><span class="token punctuation">)</span>
    time<span class="token punctuation">.</span>sleep<span class="token punctuation">(</span><span class="token number">0.1</span><span class="token punctuation">)</span>

<span class="token keyword">def</span> <span class="token function">logToFile</span><span class="token punctuation">(</span>filePath<span class="token punctuation">,</span> <span class="token operator">*</span>words<span class="token punctuation">)</span> <span class="token operator">-</span><span class="token operator">&gt;</span> <span class="token builtin">bool</span><span class="token punctuation">:</span>
    <span class="token keyword">with</span> <span class="token builtin">open</span><span class="token punctuation">(</span>filePath<span class="token punctuation">,</span> <span class="token string">'a+'</span><span class="token punctuation">,</span> encoding<span class="token operator">=</span><span class="token string">"utf8"</span><span class="token punctuation">)</span><span class="token keyword">as</span> f<span class="token punctuation">:</span>
        <span class="token keyword">for</span> word <span class="token keyword">in</span> words<span class="token punctuation">:</span>
            <span class="token keyword">print</span><span class="token punctuation">(</span>word<span class="token punctuation">,</span> <span class="token builtin">file</span><span class="token operator">=</span>f<span class="token punctuation">,</span> end<span class="token operator">=</span><span class="token string">""</span><span class="token punctuation">)</span>
        <span class="token keyword">print</span><span class="token punctuation">(</span><span class="token builtin">file</span><span class="token operator">=</span>f<span class="token punctuation">)</span>
        <span class="token keyword">return</span> <span class="token boolean">True</span>
    <span class="token keyword">return</span> <span class="token boolean">False</span>

<span class="token keyword">def</span> <span class="token function">checkTouch</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">:</span>
    info <span class="token operator">=</span> GPIO<span class="token punctuation">.</span><span class="token builtin">input</span><span class="token punctuation">(</span>Touch<span class="token punctuation">)</span>
    <span class="token comment"># print(info)</span>
    <span class="token keyword">if</span> info <span class="token operator">==</span> <span class="token number">1</span><span class="token punctuation">:</span>
        logToFile<span class="token punctuation">(</span>filePath<span class="token punctuation">,</span> time<span class="token punctuation">.</span>strftime<span class="token punctuation">(</span>
            <span class="token string">"%Y-%m-%d %H:%M:%S"</span><span class="token punctuation">,</span> time<span class="token punctuation">.</span>localtime<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
        logToFile<span class="token punctuation">(</span>filePath<span class="token punctuation">,</span> <span class="token string">"*"</span><span class="token operator">*</span><span class="token number">30</span><span class="token punctuation">)</span>
        logToFile<span class="token punctuation">(</span>filePath<span class="token punctuation">,</span> <span class="token string">"FingerPrint Start!"</span><span class="token punctuation">)</span>
        os<span class="token punctuation">.</span>system<span class="token punctuation">(</span><span class="token string">"sudo /home/pi/hub-ctrl.c/hub-ctrl -b 001 -d 002 -P 2 -p 1"</span><span class="token punctuation">)</span>
        draw<span class="token punctuation">.</span>rectangle<span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> width<span class="token punctuation">,</span> height<span class="token punctuation">)</span><span class="token punctuation">,</span> outline<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">,</span> fill<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">)</span>
        draw<span class="token punctuation">.</span>text<span class="token punctuation">(</span><span class="token punctuation">(</span>x<span class="token operator">+</span><span class="token number">10</span><span class="token punctuation">,</span> top <span class="token operator">+</span> <span class="token number">16</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token string">"FingerPrint Start!"</span><span class="token punctuation">,</span> font<span class="token operator">=</span>font<span class="token punctuation">,</span> fill<span class="token operator">=</span><span class="token number">255</span><span class="token punctuation">)</span>
        disp<span class="token punctuation">.</span>image<span class="token punctuation">(</span>image<span class="token punctuation">)</span>
        disp<span class="token punctuation">.</span>show<span class="token punctuation">(</span><span class="token punctuation">)</span>
        time<span class="token punctuation">.</span>sleep<span class="token punctuation">(</span><span class="token number">60</span><span class="token punctuation">)</span>
        logToFile<span class="token punctuation">(</span>filePath<span class="token punctuation">,</span> <span class="token string">"FingerPrint Stop!\n"</span><span class="token operator">+</span><span class="token string">"*"</span><span class="token operator">*</span><span class="token number">30</span><span class="token operator">+</span><span class="token string">"\n"</span><span class="token punctuation">)</span>
        os<span class="token punctuation">.</span>system<span class="token punctuation">(</span><span class="token string">"sudo /home/pi/hub-ctrl.c/hub-ctrl -b 001 -d 002 -P 2 -p 0"</span><span class="token punctuation">)</span>

pwd <span class="token operator">=</span> os<span class="token punctuation">.</span>getcwd<span class="token punctuation">(</span><span class="token punctuation">)</span>
filePath <span class="token operator">=</span> os<span class="token punctuation">.</span>path<span class="token punctuation">.</span>join<span class="token punctuation">(</span>pwd<span class="token punctuation">,</span> <span class="token string">"FingerLog.txt"</span><span class="token punctuation">)</span>
<span class="token keyword">while</span> <span class="token boolean">True</span><span class="token punctuation">:</span>
    displayInfo<span class="token punctuation">(</span><span class="token punctuation">)</span>
    checkTouch<span class="token punctuation">(</span><span class="token punctuation">)</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>最终的crontab：</p>
<pre class="line-numbers language-bash" data-language="bash"><code class="language-bash"><span class="token comment"># sudo crontab -e 定时任务</span>
<span class="token number">40</span> <span class="token number">21</span> * * * /home/pi/hub-ctrl.c/hub-ctrl <span class="token parameter variable">-b</span> 001 <span class="token parameter variable">-d</span> 002 <span class="token parameter variable">-P</span> <span class="token number">2</span> <span class="token parameter variable">-p</span> <span class="token number">0</span>
<span class="token comment"># vim /etc/rc.local 开机自启</span>
<span class="token function">sudo</span> /home/pi/hub-ctrl.c/hub-ctrl <span class="token parameter variable">-b</span> 001 <span class="token parameter variable">-d</span> 002 <span class="token parameter variable">-P</span> <span class="token number">2</span> <span class="token parameter variable">-p</span> <span class="token number">0</span>
<span class="token builtin class-name">cd</span> /home/pi <span class="token operator">&amp;&amp;</span> python3 finger.py<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h3 id="最终实物图">最终实物图<a class="anchor" href="#最终实物图">¶</a></h3>
<p><img src="https://cdn.jsdelivr.net/gh/weiyouwozuiku/weiyouwozuiku.github.io@src/source/_posts/%E5%B5%8C%E5%85%A5%E5%BC%8F/ESP32%E6%8C%87%E7%BA%B9%E8%93%9D%E7%89%99%E9%94%AE%E7%9B%98%E5%BC%80%E5%8F%91/ESP32%E6%8C%87%E7%BA%B9%E8%93%9D%E7%89%99%E9%94%AE%E7%9B%98%E5%BC%80%E5%8F%91_%E5%AE%9E%E7%89%A9%E5%9B%BE.jpgg" alt="ESP32指纹蓝牙键盘开发_实物图.jpg"></p>

                
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